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<br />~, . ~ I:; ') <br />lJ U .0 U' . <br /> <br />line from the Curecanti Substation to the canyon rim have <br />been completed in anticipation of the Crystal Dam construc- <br />tion. Facilities constructed to provide the prime contrac- <br />tor with power will ultimately be adapted for transmission <br />of electrical energy generated at the Crystal Powerplant <br />out of the canyon and into the Colorado River Storage <br />Project transmission system. <br /> <br />d. Prior construction.--Some construction has preceded <br />the above-described contracts in preparation for the con- <br />struction of Crystal Dam. Improvement of an existing <br />access road from Highway 347 to the bottom of the canyon <br />and about 10 miles of wood-pole transmission line from the <br />Curecanti Substation to the canyon rim above the damsite <br />were completed during 1965. The improved section of the <br />access road to the Crystal damsite is 6.5 miles long, <br />varies in width from 20 to 24 feet, and has grades up to <br />14 percent. The road will be used for construction access <br />as well as permanent access to the Dam, Gunnison Tunnel, <br />and recreation area after construction. Once in the bot- <br />tom of the canyon the road will parallel the river channel <br />to the damsite. This second section of road will be in- <br />cluded with construction of the dam. The entire road will <br />be paved either prior to construction or upon completion <br />of the dam at the discretion of the contractor. <br /> <br />A field station on the Gunnison River nearly 2 miles down- <br />stream from the dam has been built for the Bureau of <br />Reclamation construction office. The ultimate disposition <br />of field station facilities after construction has not <br />been determined. Space in the general area is also avail- <br />able for contractors to locate their office facilities. <br /> <br />Sewage treatment with subsurface disposal and a water sup- <br />ply system were included for the field station. Prior <br />approval of the design of these systems was obtained <br />through the Environmental Protection Agency from the <br />Colorado Department of Health. Designs for the small ex- <br />tended aeration sewage treatment plant for the powerplant <br />have received similar approval. All solid wastes at the <br />field station and dam will be removed from the canyon for <br />disposal at approved sites. <br /> <br />C. Environmental Protection Aspects Included in the Proiect Which <br />Would Include Mitigation Features <br /> <br />. The project plan provides minimum flows below Crystal Dam in <br />The Gunnison River through the Black Canyon. A minimum of <br />200 second-feet will be provided at all times, with a mlnlmum <br />of 400 second-feet between March 1 and September 30 in those <br /> <br />9 <br />